﻿//using System;
//using System.Collections.Generic;
//using System.Linq;
//using System.Text;
//using System.Linq.Expressions;

//namespace DynamicQueryLib
//{
//    public static class PredicateBuilder
//    {
//      public static Expression<Func<T, bool>> True<T> ()  { return f => true;  }
//      public static Expression<Func<T, bool>> False<T> () { return f => false; }
 
//      public static Expression<Func<T, bool>> Or<T> (this Expression<Func<T, bool>> expr1,
//                                                          Expression<Func<T, bool>> expr2)
//      {
//        var invokedExpr = Expression.Invoke (expr2, expr1.Parameters.Cast<Expression> ());
//        return Expression.Lambda<Func<T, bool>>
//              (Expression.OrElse (expr1.Body, invokedExpr), expr1.Parameters);
//      }
 
//      public static Expression<Func<T, bool>> And<T> (this Expression<Func<T, bool>> expr1,
//                                                           Expression<Func<T, bool>> expr2)
//      {
//        var invokedExpr = Expression.Invoke (expr2, expr1.Parameters.Cast<Expression> ());
//        return Expression.Lambda<Func<T, bool>>
//              (Expression.AndAlso (expr1.Body, invokedExpr), expr1.Parameters);
//      }
//    }
//}

 
